My devices really aren't liking my WiFi, first this happened to my iPod on 5.0 and further, but my old iPhone was fine. I upgraded my iPhone the other day and it came with 5.0.1, updated to 5.1.1 and then it bugged. The devices don not seem to work properly with my WiFi. They take ages to find the SSID, and when they do, take multiple attempts to connect. When 3G kicks in, the network is forgotten and I have to manually reconnect each time. I've tried rebooting the router to no avail.